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EWG's Tap Water Database — 2019 UPDATE

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Haloacetic acids (HAA5)

City of Wenatchee

Haloacetic acids are formed when disinfectants such as chlorine are added to tap water. The group of five haloacetic acids regulated by federal standards includes monochloroacetic acid, dichloroacetic acid, trichloroacetic acid, monobromoacetic acid and dibromoacetic acid. Read More.

Haloacetic acids are harmful during pregnancy and may increase the risk of cancer. Haloacetic acids are genotoxic, which means that they induce mutations and DNA damage. Multiple studies by the National Toxicology Program have demonstrated the cancer-causing properties of individual haloacetic acids in laboratory animals. The Department of Health and Human Services is currently considering listing di- or tri-haloacetic acids for possible inclusion in its comprehensive Report on Carcinogens.

Click here to read more about disinfection byproducts.

 

38

Samples

0

Samples exceeding legal limit (MCL)

19

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND10ND
20131.52 ppb551.10 ppb - 2.40 ppb
20140.606 ppb167ND - 2.30 ppb
20150.475 ppb124ND - 2.30 ppb
20160.500 ppb21ND - 1.000 ppb
20171.85 ppb221.20 ppb - 2.50 ppb

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.1 ppb

The EWG Health Guideline of 0.1 ppb for the group of five haloacetic acids, or HAA5, was defined in a peer-reviewed scientific study by EWG and represents a on-in-a-million lifetime cancer risk level. This health guideline protects against cancer.

EPA Maximum Contaminant
Level (MCL) 60 ppb

The legal limit for the group of five haloacetic acids (HAA5), established in 1998, was based on the need for residual disinfectant levels in water served to customers and the cost of treatment. This limit does not fully protect against the risk of cancer and harm to the developing fetus due to exposure to haloacetic acids.

ppb = parts per billion

All test results

Date Lab ID Result
2012-08-2082391ND
2013-08-19846911.10 ppb
2013-11-05210231.30 ppb
2013-11-05210211.30 ppb
2013-11-05210242.40 ppb
2013-11-05210221.50 ppb
2014-02-0612242ND
2014-02-0612244ND
2014-02-0612243ND
2014-02-0612241ND
2014-05-0545684ND
2014-05-0545682ND
2014-05-0545683ND
2014-05-0545681ND
2014-08-05825031.40 ppb
2014-08-05825022.30 ppb
2014-08-05825041.30 ppb
2014-08-05825011.30 ppb
2014-11-04246721.10 ppb
2014-11-04246731.000 ppb
2014-11-0424674ND
2014-11-04246711.30 ppb
2015-02-0311132ND
2015-02-03111311.10 ppb
2015-02-0311134ND
2015-02-0311133ND
2015-05-0447203ND
2015-05-0447204ND
2015-05-0447201ND
2015-05-0447202ND
2015-08-06866921.20 ppb
2015-08-0686694ND
2015-08-06866932.30 ppb
2015-08-13892411.10 ppb
2016-08-291.000 ppb
2016-08-29ND
2017-08-211.20 ppb
2017-08-212.50 ppb